Questions about my 2003 5.7 Stroker build , CR, PCM - Hemi Truck Club
 
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Old 06-18-2017, 10:14 PM   #1
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Questions about my 2003 5.7 Stroker build , CR, PCM

Hi Guys,
Been reading this since I bought my 03' Ram 7 years ago, but never really had the need to post a question till now.
I am in the process of ordering a stroker kit for my 5.7 hemi , and the question of how much compression can I run with a stock 03 PCM and a Superchips 91 tune . I blew up a piston at 253K miles and am going to get a stroker motor to go in. The build is for a Daily Driver 03 RCSB , lowered 2/4 , hauls a few tools around, and a 20' SeaRay a couple times a year. This truck has to be dependable in the northwest, temps from 100 down to 20 degrees, rain , snow, I wanted a 370 stroker but all the builders are backed up for 2-3 months and I need one quick, like 30 days.
Quickest choice is a 392 stroker from a 5.7 block.
Manley Stroker rotating assembly
Pistons ??? what CR can I run ??
Comp Cams 260 (beats most cams out there until 4,800 rpm)
Pushrods 6.1 pushrods ???
PAC 1218 springs / Pac locators
5.7 heads , minor exhaust port matching to my long tube headers, Just a cleanup mill to the heads .005"
It has the original 545rfe in it, with the Transgo HD-2 kit in it, resistor added, PLUS I am also running the sonnex line booster, yellow wire delete at tcm, works well . I have no plans for a converter, I drive 150 miles a day and this is my work rig, needs to get decent gas mileage, and be dependable for another 50K miles , and be able to hold it's own against any Beemers or Rice Burners that want to cut me off !!!!
So whats a safe compression ratio ? 10:1 , 10.25:1 / 10.5:1 ???
PCM issues ?
Pushrods ?
Thank You

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Old 06-19-2017, 03:18 AM   #2
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First, since it's an 03... You don't have the tuning with the 03 pcm and a 392 stroker you would have with a 05 pcm. You will have to get it tuned. 03 pcm's are terrible to tune. You start adding more hp/tq and the trans will go next. I'm sure you know about how weak the 545rfe trans is. It gets expensive when adding a stroker kit. For what your using the truck for and the need for good gas mileage and reliability. Just put a stock 5.7 back in with a 260 or a RV style mild cam. You can use the Superchips with those cams. With your truck on the highway so much, 4.10 gears should be a good match to add a little pep as well as take a little stress off the 545rfe trans.

Just my .02 cents.
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Old 06-19-2017, 04:36 AM   #3
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For once im in agreement with Stu, it being your daily driver and with no plans for extensive mods (money hole) put a stocker back in it and drive it for another 250k. If you are serious about modifying your 03. Your list should look like this:
Replace 03 pcm with 05.
Replace transmission suitable to support you engine.
Build your stroker motor, 10.25 cr for na and 9 cr for boost.
Supporting mods as needed to enhance your end goals.
Ive had my 03 since new and it cant be replaced. But the reality is the 03 pcm is primitive and the 545rfe has a weak od. Both will need to be replaced as power goes up.
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Old 06-19-2017, 04:41 AM   #4
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If you go with the stroker, keep compression to 10. Your plan on the heads is good, the 03-08 heads don't seem to get the love they use to since the eagles have become more accessible and the price point has come down.
since your talking RCSB I think the 545 will live behind a mild 392 as long as your vigilant and keep it's OD weakness in mind. But Stu,Greg and Kieth are far more knowledgeable on what a 545 will take.
Gears will help either a stock rebuild or a 392 greatly
I myself would be more inclined to use a SRT 6.1 cam and the gears , less torque thru the box but the 4.56s will get the weight of the truck moving in to the power band.
and the 03 PCM has to go if you ever plan on making power down the road.
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Old 06-19-2017, 04:58 AM   #5
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For the 545 to stand a chance you have to be disaplined about tuning off the od every time you play. I ran a fairly stout motor using one and mine never broke. 2800 stall, 4:10 gear, short tires and it ran mid 13's easy enough. But mine was the exception and not the rule. 03's i believe do have an advantage with its control over its od that the newer models dont have.
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6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...

1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
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